The ZGTS needles are made from a titanium alloy so they are made to last. This derma roller is most suitable for use on less sensitive and delicate areas. It is ideal for stretch mark removal and scar reduction treatments on fleshy areas on the body. It is popular with those people looking to use a derma roller for skin problems such as stretch marks and scars. It is suitable for use on all types of skin and is considered a very effective roller.